Sanding or buffing device



Dec. 27, 1949 w. sMlTH 2,492,372

SANDING OR BUFFING DEVICE Filed May 4, 1948 2 Sheets-Sheet 1 mi I Dm 27 1949 w. SMITH 492,372

SANXJINGy OR BUFFING DEVICE Filed may 4, 3.948 z swam-sheet 2 Patented Dec. 27, 1949 UNITED STATES" PATENT OFFICE 2,492,372 SAND-nio mi prim Warne Smith, Decatur', Ga. Application 1948, Serial No. 25,099 4 Claims (Cl. oie-elio) This invention relates to an improvedsanding or builng device of the type adapted to be opere ated by a hand drill or press drill, and the primary object of the invention is to provide @device of this kind characterized by novel construction providing advantages of simplicity, lolliei os't', and greater etciency and durability operaia Other important objects and 4advantage tear' tures of the invention will be apparent tile' following description and accompanying dlau' ings, wherein, merely for present' purposes of iig lustratin, a specific embodiment of the is set forth in detail.

In the drawings:

Figure 1 is an end elevation.

Figure 2 is an enlarged vertical longitudinal section. l

Figure 3 is a horizontal sectio'li` taken the lineS-S of Figure 2.

Figure 4 is a transverse vertical section;

Figure 5 is a top p lan view of ltile slide block, and,

Figure 6 ls a top plan view of the lower slide block.

Referring in detail to the drawings, the illustrated sanding or bufling device ooiiipr'ises aren atively stationary horizontal tol) plate 'fof elongated rectangular shape, fo'rliied'l centrally a round hole 8', surrounded by four countersurik holes 9 formed through Ithe plate' 1. A confiniinabl'y rectangular upper slide block 1 0 isfcentralf ized with respect to the hole 8 and is' secured to the underside of the top plate 1 by 4f ojui' studs or screws Il passing through the' h 'oles 9 and threaded into the top of the block l0. Tile upfper slide block` is' substantially shorter and narrower than the plat-e I so as to liesiacje'd on all sides from corresponding edges of tile" 'plate 1, but is substantially thicker and heavier than the plate 1.

The upper part o f the slide block IU is' formed with a round opening I2 opening through its top surface t3 and larger in diameter than and con? centrically disposed with respect to' the hole in the .plate 1. A ball bearing 4 iras its outer race l5 press litted in the opening 1 2. The louter part of the block l0 is formed a longitudirijal slide I6 depending below the block bottom I 'l and extending along the middle' ftle block in spaced relation to the sides thereof, the side I8 of the slide I6 being bevelle'd to inclin inwaigdly, as indicated in Figure 4. A hole I2 axially' aligned with but smaller in dial'ljietel"V than the hole' I2 is formed through the lov'vler' partqf the block |0` and opens through its bottom' T.

Z s lower slide block zo'generoliy siiiiiloi lo size and cross section totlie iipiier' slide bloei; 'lu has formed longitudinally its upper part o I ns'ig tudiiial Asloty 2i opening .tlifoiigii its 'top 2 2 and shaped to ooiiiorirlably ao 'slide'bly afcoiiiino? de te the slide l5 .ou tlie iiiipor slide loljook." 'lino loifier part of tlie lowei slidelolook 2t isforiiied with o troiisgfoisoly'eloiiooted eifel" ooeiiiiisit wiijeli opens tliizoightlie' 'bottom 2 4 ojf'tlie'lilo'ol'i 2li' and linens 'ai its fe i th smul; .the biol @li-,1.1 2,3 Denis ocfll 'iiiili' the oreilles 1'2" io theiipiier si f o dttgni'plt 2.5 .f the same width, but 'eivllat shorter tjl'ie 'top lat iis cent-rel d iyitiirosiieot Agtjotiie"ioiv'ei slide bloes zt and is' scoured to 'tiieiiottoio 2.9 theieoi bjy tolli yiililiiitially' b's's. WS O s'ts 1 6 lilllose'lieads are c fllntpg k, as indicated 2.7, with respect le@ tlil'ldger ""'fafi'e 'tli'e limoni Plate 25- f A rectangular traine or enclosure 2s coilstf tutediby vertical' falls 3 0 ofv sjiistaiitisll'ii 'the lieiglit of the 'assembled raiitl" lowoi slide block lp and z ll, is of std iitially' trie saule width es but soiiiewliat snorte'r than the' tot ol'o'te I and is of the saine dimensions s'the bottom p lete- 25, and llas an inwardly projecting' ii'arige 3l extending' thereof-curio, into wliioli Harige countersunk 'studs o'r sWS 3 2, passing' tllrou gli thebottoni plate" 25A, are'tiieadd t6 lolliit 'lie eiioflosure'zs o'ii tile bottom plete free to vibrate longitudinally with resnec't yto 'the top plete' l, and pr'ot'eotively eijijelo's tiie slide .iiiecliaii'isin rrlieunit ooiiiiiosed of' trie bottoni plate" 25, enclosurei 2g, arid lower' slide block' zip' are vibrateid eiidwise ivi't'ii ie t to relatively .stationery top plate py tl i o rjtiool oneratiii'gslieft 3 3, oili'osje opp; 'iiefid por on s4 is .iii tiie foriii of a reduced through the lio-1e rz'f; 'with' die lower orio 4p 'of the portion 3 8 substantially iiusli with .the bottoni o f the' upper slide''blockV U, as shown ini'igilrtS'22l11d4- The lower end 40 of trie lower shaft' portion 38 has thereon a depending cylindrical pin 4| which is eccentrically disposed and has on its upper end a shoulder 42 which rests upon the top of the inner race 43' of a ball bearing 44 located in the oval opening 23 in the lower slide block 20, the pin 4I being press fitted in the inner race 43'. 'I'he outer race 43 of the bearing 44 is arranged to rollably engage the walls of the oval opening 23, as the operating shaft 33 is turned by the drill 36, whereby the unit Icomposed of the lower slide block 20, enclosure 29 and bottom plate 25 is vi-brated endwise with respect to the top plate 1,

At the opposite ends of the device the lower corners defined by the enclosure 29 and bottom plate 25 are protectively cushioned by L-shaped cross section rubber pads having portions 45 underlying the bottom plate and vertical portions 46 along the outside of the enclosure. 'Ihese pads are secured in place by any suitable means which may comprise or be supplemented by the abrading or polishing sheet retaining means, comprising transversely elongated strips 41, formed with longitudinal slots 48, and inserted upwardly into inverted channels 49 secured to the end walls of the enclosure 29 and secured in place therein by pins or the like 50 traversing the strips 41 and the channels 49. As shown in Figure 2, a flexible abrading or polishing sheet l, sufficiently longer than the bottom plate 25 to afford free ends extending beyond the ends of the bottom plate, has these free ends brought up around the pad portions 45 and 46 and between the vertical pad portion 46 and the inner sides of the strips 41 and passed outwardly through the slots 48 before the strips are inserted in the channels 49, whereby when the strips 41 are so inserted and secured, the pads will be held in place and the free ends of the abrading or polishing sheet 5| will be clamped in the channels 49. The presence of the lower pad portions 45 at the underside 28 of the bottom plate 25 acts to space the abrading or polishing sheet 5I from the plate 25 in stretched condition, so that the sheet 5I will desirably engage the surface to be sanded or polished when the device is applied thereto and operated.

' What is claimed is:

' l. A sanding or polishing device comprising a relatively stationary upper section and a movable lower section, said upper section comprising a relatively flat cover plate, an upper slide block secured to depend from the underside of said cover plate and spaced from the edges of said cover plate, a vertical operating shaft journalled in said upper slide block and rising freely through an opening formed in said cover plate, said shaft having an eccentric pin depending below the underside of said upper slide block, said lower section comprising a lower slide block positioned beneath said upper slide block, and a bottom plate secured to the underside of said lower slide block, and extending beyond the edges of said lower slide block, said bottom plate .being of substantially the same shape and width as said cover plate and having side walls on its side edges rising into clqsely spaced relation to the underside of said cover plate at the side edges thereof so as to form an enclosure, said bottom plate having end walls substantially continuous with its side walls, a sanding or polishing sheet extending along the underside of said bottom plate and upwardly along said end walls, securing means on said end walls holding the ends of said sheet in place, means supportably and slidably connecting said lower slide block to the underside of said upper slide block of endwise reciprocation 2i relative thereto, and journal means on said lower slide block journalling said eccentric pin whereby said lower section is reciprocated end-wise relative to said upper section when said operating shaft is rotated.

2. A sanding or polishing device comprising a relatively stationary upper section and a movable lower section, said upper section comprising a relatively flat cover plate, an upper slide block secured to depend from the underside of said cover plate and spaced from the edges of said cover plate, a vertical operating shaft journalled in said upper slide block and rising freely through an opening formed in said cover plate, said shaft having an eccentric pin depending below the underside of said upper slide block, said lower section comprising a lower slide block positioned beneath said upper slide block, and a bottom plate secured to the underside of said lower slide block, and extending beyond the edges of said lower slide block, said bottom plate being of substantially the same shape and width as said cover plate and having side walls on its side edges rising into closely spaced relation to the underside .of

., said cover plate at the side edges thereof so as to form an enclosure, said bottom plate having end walls substantially continuous with its side walls, a sanding or polishing sheet extending along the underside of said bottom plate and upwardly along said end walls, securing means on said end walls holding the ends of said sheet in place, means supportably and slidably connecting said lower slide block to the underside of said upper slide block for endwise reciprocation relative thereto, and journal means on said lower slide block journalling said eccentric pin whereby said lower section is reciprocated end-wise relative to said upper section when said operating shaft is rotated, the ends of said cover plate being sufficiently extended beyond the ends of said bottom plate to serve as cover for the enclosure dened by the walls of the bottom plate while said lower section is reciprocated relative to said upper section.

3. A sanding or polishing device comprising a relatively stationary upper section and a movable lower section, said upper section comprising a. relatively flat cover plate, an upper slide block secured to depend from the underside of said cover plate and spaced from the edges of said cover plate, a vertical operating shaft journalled in said upper slide block and rising freely through an opening formed in said cover plate, said shaft having an eccentric pin depending below the underside of said upper slide block, said lower sec-- tion comprising a lower slide block positioned beneath said upper slide block, and a bottom plate secured to the underside of said lower slide block, and extending beyond the edges of said lower slide block, said bottom plate being of substantially the same shape and width as said cover plate and having side walls on its side edges rising into closely spaced relation to the underside of said cover plate -at the side edges thereof so as to form an enclosure, said bottom plate having end walls substantially continuous with its side walls, a sanding or polishing sheet extending along the underside of said bottom plate and upwardly along said end walls, securing means on said end walls holding the ends of said sheet in place, means supportably and slidably connecting said lower slide block to the underside of said upper slide block of endwise reciprocation relative thereto, and journal means on said lower slide block journalling said eccentric pin whereby said lower section is reciprocated endwise relative to said upper section when said operating shaft is rotated, means journalling said operating shaft in said upper slide block comprising an annular bearing assembly conformably seated in a depression formed in the upper side of said upper slide block through which said shaft supportably and rotatably extends, and la portion on said cover plate overlying said bearing assembly and y retaining the same in place.

4. A sanding or polishing device comprising a relatively stationary upper section and a movable lower section, said upper section comprising a relatively flat cover plate, an upper slide block secured to depend from the underside of said cover plate and spaced from the edges of said cover plate, a vertical operating shaft journalled in said upper slide block and rising freely through an opening formed in said cover plate, said shaft having an eccentric pin depending below the underside of said upper slide block, said lower section comprising a lower slide block positioned beneath said upper slide block, and a bottom plate secured to the underside of said lower slide block, and extending beyond the edges of said lower slide block, said bottom plate being of substantially the same shape and width as said cover plate and having side walls on its side edges rising into closely spaced relation to the underside of said cover plate at the side edges thereof so as to form an enclosure, said bottom plate having end walls substantially continuous with its side walls, a sanding or polishing sheet extending along the underside of said bottom plate and upwardly along said end walls, securing means on said end Walls holding the ends of said sheet in place, means supportably and slidably connecting said lower slide block to the underside of said upper slide block of endwise reciprocation relative thereto, :and journal means on said lower slide block journalling said eccentric pin whereby said lower section is reciprocated endwise relative to said upper section when said operating shaft is rotated, said journal means comprising a relatively large diameter ball bearing assembly rotatably carried by said eccentric pin, and an oblong slot formed in the upper side of said lower slide block presenting sidewalls against which said ball bearing assembly rolls as said operating shaft is turned.

WAYNE SMITH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

